How long is a piece of string? As with everything, it's a balance of risk versus benefit. The AF is rate controlled. Is the patient anticoagulated? History of PE, or current PE? Why are they doing the stress test?

Agree w/ghillbert's observation: risk VS benefit.
You said pt has no c/o CP?
New onset CHF?
Has the EF changed recently?
Increasing or new onset SOB/DOE? (depends how big the PE is/was, how much lung is affected?) -- are they trying to sort out why the pt is still SOB, even after initiating PE tx?
Or is the question one of eval exercise capacity/response?
So many unknowns here.

2 sets of negative enzymes, chest pain free, and controlled AF on anticoagulants.........I often see Pt's like this for a stress test. What kind of test is ordered? SOB would be my initial concern during the test, unless the PE has resolved.